@misc{indiciae1fa7eadddeb0,
  title = {Sampling: the source of the data.},
  author = {J A Heermann and M E Megel},
  year = {1994},
  doi = {10.1097/00006527-199403000-00014},
  url = {https://pubmed.ncbi.nlm.nih.gov/7800765/},
  note = {Source identifier: 7800765}
}